Chill-mold



W. H. NICHOLS.

CHILL MOLD. APPL|ATION FILED AUG.I8, 1919.

INVENTOR UNITED STATES PATENT OFFICE.

WILLIAM H. NICHOLS, OF PITTSBURGH, TENNSYLVANIA.

CHILL-MOLD.

Application filed August 18, 1919.

To all whom, it may concern:

Be it known that 1, WILLIAM H. NioHoLs, a citizen of the United States, andresident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Chill- Molds; and I do hereby declare the follow ing to be a full, clear, and exact description thereof.

My invention relates to chill-molds for casting rolls for rolling metal.

As is well known these chill-molds are made of cast iron and the chill in the cast ing is obtained by the contact of the hot metal in the mold with the inner walls of the mold, so that the metal for a certain distance in is converted into a hard white iron while the interior of the casting will have the toughness which gives it its requisite strength. The heat given out by the cast metal penetrates through the chill with extraordinary rapidity, and if the walls of the chill are not sufficiently thick to absorb the greater portion of the heat, the chilling effeet may be neutralized by the heat evolved from the central portion of the casting not being conducted away with sufiicient rapidity. hen the metal is being poured into the chill the skin of the casting solidifies and the metal in the interior commences to part with its heat contracting away from the interior of the mold by so doing. The mold at the same time absorbing the heat expands away from the exterior of the casting.

In order to prevent this too great and sudden expansion of the chill-mold, and at the same time reduce the necessity of making it so thick, water has been used for cooling the chill and for this purpose a water-chamber has been cast in the walls of the chill through which water is caused to circulate during the casting operation. Difliculty, however, has been encountered in this method due to the uncertainty of accurately fitting the cores in the chill to form the water-chamber so as to insure a wall in the chill of uniform thickness. If the wall is not uniform in thickness there will be a difference in the expansion of the walls of the chill and consequently the chill may expand sufiiciently at one point to draw away from the casting, while at another point no such action takes place. This will result in a defective casting.

The object of my invention is to provide for the water-cooling of'the chill-mold so Specification of Letters Patent.

Patented Apr. 6, 1920.

Serial No. 318,378.

that there will be a uniformity of cooling ac tion throughout the entire mold, and the heat absorbed equally so that there will be a uniform cooling action.

To these ends my invention comprises the novel features hereinafter set forth and claimed.

In the drawing the figure illustrated is a vertical section of a chill-mold embodying my invention.

In the drawing the numeral 2 designates the lower box which is of the usual construction filled with sand 3 in which a wood pattern is molded, which forms one of the couplings at and necks 5 of the roll.

Supported on the box 2 is the chill 6 which is cylindrical in form and formed of cast iron. The chill 6 has the bottom flange 7 and the upper flange S.

A water-jacket 9 surrounds the chill 6, said water-jacket being bolted to the flanges 7 and 8 of the chill by bolts 10. A gasket 11 is interposed between the flange 7 and the lower end of the water-jacket to guard against leakage.

The water-jacket 9 has the inlet 12 at its lower end for the admission of water or other cooling liquid and the outlet 13 at its upper end for the discharge of the water.

Handles lat are provided for handling the water-jacket and the chill secured thereto.

Resting on the water-j acket 6 is the upper box 15 likewise filled with sand and in which the other coupling and neck of the roll is cast. The customary head 16 is provided in which the impurities of the iron which rise to the top in casting are collected.

The casting gate 17 conducts the metal from the upper end of the mold down into the lower journal of the roll, all in the ordinary manner.

lVhen the metal is poured into the mold and fills the same the action of the chill will be to harden or solidify the metal which comes in contact with its inner walls, and the metal in the interior commences to part with its heat and contract away from the interior of the mold as it does so. The chill under conditions where no water-cooling is employed will become highly heated by absorbing the heat from the molten metal contained therein, and will expand away from the exterior of the casting. By circulating water through the water-j acket, however, this expansion of the chill is counteracted by the cooling efl'ect of the water, so

that this drawing away of the chill from the exterior of the casting is largely avoided, and furthermore, the thickness of the Wall of the chill need not be so great as Where this heat has to be absorbed by the metal of the wall.

By having the water-jacket formed separate from the chill and removably secured thereto, the difiiculties heretofore arising from casting the water compartment in the chill itself are avoided, and furthermore when the chill wears out the water-jacket may be removed and applied to a new chill.

. hat I claim is 1. A chill-mold comprising the inner chill, a water-jacket surrounding said chill, and removably secured thereto, said waterjacket forming one continuous uninterrupted passage completely encircling said chill having an inlet and outlet for the admission and discharge of the cooling fluid. v 2. A chill-mold comprising the inner chill, flanges projecting out therefrom, and a water-jacket secured to said flanges forming one continuous uninterrupted passage completely encircling said chill having an inlet and outlet for the admission and discharge of the cooling fluid.

In testimony whereof, I, the said WIL- LIAM H. NIoHoLs, have hereunto set my hand.

VILLIAM: H. NICHOLS. lVitnesses: 7

Row. D. TOTTEN, JOHN F. lVILL. 

